RE: Does your head spin regularly like you have a merry-go-round implanted in your brain?- Then this is for you

A friend had this and she went to a physiotherapist if I recall, who performed some head maneuvers which made her feel like she was losing all sense of balance and orientation and it was quite scary, but then after the session, and increasingly the next few days, she was cured of all the dizziness she was experiencing. Something about restoring the position of some "crystals" in the ear canal, which you mentioned above.